Radial Engineering Highline Stereo Passive Line Isolator

The Highline Stereo is a two channel passive line isolator designed to connect guitar and amp modelers to a mixer for live touring and recording applications, featuring premium Jensen transformers for exceptional audio performance.

Run your amp simulator or modeler without fear of signal loss with the Radial Highline Stereo. This compact unit converts your unbalanced line-out into a balanced one while keeping your full-volume signal. Sweetwater guitarists choose the Highline Stereo for its Jensen 1:1 transformers that isolate your signal, protect against phantom power, break up ground loops, and retain full-volume signal integrity. The sum feature adds extra versatility, turning the input and thru jacks into a passive mixer that can sum down stereo sources to mono. All these features are doubled with the stereo inputs and outputs, allowing you to run multiple rigs, split your signal, or sum an XLR signal from stereo to mono. If you still have noise, use the Highline Stereo’s ground-lift switch to eliminate unwanted noise. Grab a Highline Stereo and keep your signal as strong going out as it was coming in while protecting your tone and gear.

Highline Stereo Applications
Connect your amp sim to the PA
The Highline Stereo allows you to send the signal from your guitar amp sim right to the PA while retaining the signal level and sound quality. The Jensen transformers inside provide isolation to reduce noise while protecting your gear from accidental phantom power activation.

Sum a stereo amp sim to mono
The Highline Stereo can also be configured to accept a stereo signal and sum both channels to the XLR output, so you don’t have to change any cabling on your pedalboard when channel space is limited at the PA. When the XLR outputs are summed together, the Thru outputs can still operate in stereo.

Use the Thru to monitor locally
The Thru outputs can be used to monitor your signal locally on one or two stage amplifiers. If using a single stage amp, press the Thru Sum switch to automatically feed both channels to the amp, while maintaining a stereo signal at the XLR outputs.